1 files changed, 2 insertions, 0 deletions
diff --git a/blockdev.c b/blockdev.c
index 2ab236a82d..80605a2bac 100644
--- a/blockdev.c
+++ b/blockdev.c
@@ -1286,6 +1286,8 @@ void qmp_transaction(TransactionActionList *dev_list, Error **errp)
         assert(dev_info->kind < ARRAY_SIZE(actions));
 
         ops = &actions[dev_info->kind];
+        assert(ops->instance_size > 0);
+
         state = g_malloc0(ops->instance_size);
         state->ops = ops;
         state->action = dev_info;